Try another version of this question Get help: Box 1: Enter each element of the matrix as number (like 5, -3, 2.2)
Add: `[(7,-3,-1),(-3,-6,1),(-4,-6,5)] + [(0,-8,6),(-4,-5,4),(5,-6,2)]`
`[(7,-11,5),(-7,-11,5),(1,-12,7)]`